Britney Spears' stalker

Britney Spears has reportedly been receiving disturbing letters and packages from a stalker.

The troubled singer is said to have been so concerned by the mail, which included a letter detailing how to make bombs and another containing "threatening language and weird gibberish", she has handed all correspondence over to the FBI (Federal Bureau of Investigation).

A source close to the singer told E! Online: "A lot of the things she was receiving were disturbing stalker kind of stuff. So, to be safe, her security team is turning it all over to the police and FBI."

While insiders claim the mail had been sent to various locations associated with mother-of-two Britney, Los Angeles Police Department spokesperson Ana Aguirre said no specific investigation had been launched yet.

She added: "We have been looking at allegations that have cropped up in the past couple of months."

An FBI spokesperson also refused to comment on the allegations.

Meanwhile, Britney is paying her dad Jamie $2,500 for every week he looks after her.

Jamie - whose co-conservatorship over his 26-year-old daughter was extended until July 31 - was also given the authority to use Britney's funds to hire a car for her security team.

Britney is believed to be "doing well" following a turbulent few months during which she was hospitalised.

If she continues to improve Los Angeles Superior Court Commissioner Reva Goetz may consider dissolving the conservatorship before the scheduled July 31 end date.

A source said: "Is it possible she might make significant enough progress to get her life back in three or four months? Yes, and her dad would like nothing more than for that to happen."